Citation
Abstract
Projections for space exploration in the next few years call for several vehicles at Mars at the same time. Since all these vehicles will be in the field of view of a single DSN antenna, it would be advantageous if more than one carrier could be transmitted at the same time. Previous experience at S-band (2110 to 2120 MHz) indicated that multiple-uplink carriers would generate noise bursts and intermodulation products (IMP) under certain conditions. This article describes some experiments done on the beam waveguide (BWG) at DSS 13 looking for these effects at X-band (7145 to 7190 MHz). Two carriers produced both noise bursts and IMP at 10 kW/carrier, IMP without noise bursts at 7 kW/carrier, and neither noise bursts nor IMP at 5 kW/carrier. Three carriers produced small amounts of IMP without noise bursts at 6 kW/carrier (the upper limit of our ability to test). The preliminary conclusion is that a system using two or three carriers at 5 kW/carrier would probably work satisfactorily, but additional testing is required before committing to such a system.
Details
- Volume
- 42-127
- Published
- November 15, 1996
- Pages
- 1–8
- File Size
- 328.3 KB